..This study examines the effect of early implementation of daycare and school-entry requirements for varicella vaccination on recorded varicella immunity of preschool and school-aged children in Massachusetts...

One dose of varicella vaccine does not prevent school outbreaks: is it time for a second dose?

..Further studies are needed to identify these factors, to isolate possible additional effects from a varicella vaccination program. Untangling the contribution of these different factors on HZ epidemiology will be challenging...

Critical issues in implementing a national integrated all-vaccine preventable disease surveillance system